Anyway I'll take a look at the pll tonight. My chipset northbridge heatsink does get quite hot at 133MHZ so I have installed a small chipset cooler fan. I am running a ATI9250PCI card with the onboard SISVGA disabled in Windows. I am running Windows ME on the set up at the moment but I can run Linux Ubuntu Hardy Heron as well. Anyway running at 133MHZ is certainly a no go for the onboard 512k cache and even at 124MHz the cache is decidedly dodgy. However the board is quite happy running at 4.5x133 with any of the K6plus chips that I have at around 2.0V. One of the chips I have even runs at 1.9V@600MHz.

I can get into Windows at 667Mhz using a K6-2+/550 at 2.3V but it is far from stable. Unfortunately there is no temperature monitor on the board, and it may be the temperature that is causing the problems at this speed and voltage.

it is a start. I think you probably should not start with 667 mhz speed but should use k6speed to manually and stepwise go for it.

two possible reasons: first the wc-system could need some time to work efficiently and second, the cpu gets incredible hot at that speed before booting into windows because it is windows (nt4 and up) that puts the cpu immediately and continously into some kind of do nothing - state, which helps a lot to keep it as cool as possible. win98 needs a program like "rain" or similar that does exactly the same.

also you could check out first how much of a help the wc-solution actually is by using another system and comparing the temps reached here with the temps reached when using a normal fan.

I have managed to get a k6-2+570 reach 666mhz from within windows. I used an "ordinary" fan-system CAK-38 for cooling. it does produce some noise, but as long I do nothing (desktop), the system "works", I can open programs, but I was not able to run any bench successfully - the system freezed very quickly

Before I go looking to cool with a peltier I will try the Epox MVP3G2 board I have which I know will run 112fsb with no problems. At least with this board I can check temperatures at 618 @ 103 and 112 fsb speeds. Using a CAK38 on this board a K6 3plus cpu runs at about 35C at 600MHz plus.

The HDD on my old Gigabyte G5-SMM set up finally gave up the ghost. I replaced it with an old WD 20GB HDD and put Windows 98se on it. After setting everything back up of course I tried the tweaks and then just went into Superpi.

Last summer I suddenly had the urgent need to "play" again with my ss7-boards but ran into many troubles. my great pci-vga card (nvidia 5200, 128bit, 250/200mhz) needs its capacitors replaced and also suddenly my open-gl sub-system does not work any more. I gave up then because of time constraints but maybe I am coming back ...

Still playing around with old hardware? Nice!I gave up with that some time ago, still an echo of good old days is lying around in my bench as a set of 10 K6 III+ CPUs ...Hope you all guys are doing well, despite of work, weather and life in general. Keep up and greetings from Zurich, Switzerland!